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3-Point Stepper Control with SIMATIC S7-1200/S7-1500

Entry

Associated product(s)

STEP 7 (TIA Portal) offers you the technology object "PID_3Step" to control valves and actuators with integrating behavior for SIMATIC S7-1200/S7-1500 PLC. The handling of this PID controller with self tuning is shown using a mixer tap as an example.

Description
The valve of a mixer tap will be controlled according to a desired given temperature.
A three-way mixing valve with valve actuator is used. The valve is digital controlled in both directions. This is referred to as a 3-point stepper control.
Varying the valve position can yield any mixing ratio of hot and cold entering water and so the water outlet temperature.

Figure 01

The application on hand provides quick configuration and commissioning of your mixer tap.
The application also contains a simulation of the controlled system, which enables familiarizing yourself with all functions of "PID_3Step".
The following features can be conveniently operated via KTP900 Basic PN:

Switching between automatic and manual mode

Transition time measurement of the valve

Visualization of the valve position

Trend curves of setpoint, process value and output value

Switching between the real controlled system and the simulation

Disturbance value control in simulation mode

Specifying the behavior in the case of errors and their simulation

Specifying the deadband width for energy saving operation

Manually specified control parameter and automatic tuning

Online monitoring of the "PID_3Step" controller block

Modifying the configuration during runtime

Advantages

PID Control Simple programming with configurable blocks. Simple commissioning through automatic calculation of the control parameters for optimal control quality and clear signal monitoring with trace function.

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